JPS60128920A - Exhaust repurifier of diesel engine - Google Patents

Abstract

PURPOSE:To reduce the sizes of an electric heater and a battery by accumulating thermal energy generated by the heater, in a heat accumulator in advance and heating regenerated gas by accumulated energy so as to heat a collecting member provided with catalizer when said member is repurified. CONSTITUTION:Particulates involved in exhaust gas fed from an engine 1 are collected by a collecting member 4 and a clogged amount detector 24 which detects variation in electric resistance between electrodes 25 and 25 discriminates that the quantity of collected particulates reaches a specified value. If the detector discriminates the member is clogged, an electric heater 13 is electrified and heated to heat a heater accumulating member 14 so as to accumulate heat energy. It is discriminated whether the temperature of heat accumulating member detected by a temperature detector 23 reaches a specified value or not and if an air pump 6 is actuated on the basis of the discrimination of YES. The first and second opening and closing valve 9 and 10 are closed and the third opening and closing valve 11 is opened. And high temperature regenerated gas (or air) is produced in the heat accumulating member 14 and sent to the collecting member 4 so as to heat and burn particulate composition.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention captures particulate components (particulates) such as unburned carbon contained in the exhaust gas of a diesel engine using a catalyst-equipped collection member provided in an exhaust passage. Regarding an exhaust gas purification device for a diesel engine that is designed to collect gas, we will particularly focus on measures to regenerate the catalyst-equipped collection member.

(Prior art) This type of diesel engine exhaust purification device in which a collection member (filter member) for collecting particulate components is arranged in the exhaust passage is well known, but this device does not last for a long time. Over time, the collection member may become clogged due to the accumulation of collected particulate components, resulting in a reduction in engine output. Once it is resolved, it is necessary to perform its regeneration.

As an example of a method for regenerating such a collection member, conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 56-56921, a collection member disposed in an exhaust passage is It is equipped with a catalyst that has a catalytic effect to oxidize and burn unburned gas in the exhaust gas, and an electric heating element (
A heating means such as an electric heater is provided, and the exhaust gas heated by the heating means is guided as regeneration gas to a collecting member with a catalyst, and is further raised to a high temperature by an oxidation reaction in the collecting member with a catalyst. A system has been proposed in which particulate components collected in a collection member are burned and removed by the exhaust gas.

By the way, in this proposal, the particulate components are heated and combusted using the heat generated by the re-combustion of exhaust gas in the catalytic collection member, so the capacity of the heating element of the heating means, the capacity of the battery, etc. must be reduced to some extent. However, considering that heating to a high temperature of approximately 600°C or higher is required to effectively burn and remove the particulate components, the heating element volume and heating capacity of the heating means are too small. It cannot be set.

(Object of the Invention) Therefore, the object of the present invention is to combine the regeneration gas for heating and regenerating the above-mentioned catalyst-equipped collection member with an electric heating element and a heat storage material that stores thermal energy from the electric heating element. The object of the present invention is to make it possible to set the capacity of the electric heating element and the battery to be smaller than that of the conventional one while effectively regenerating the collecting member with the catalyst.

(Structure of the Invention) In order to achieve the above-mentioned object, the solution means of the present invention is an exhaust gas purification device for a diesel engine that is provided with a catalyst-equipped collection member for collecting particulate components in the exhaust passage. A regeneration gas supply device for supplying regeneration gas for burning and removing the particulate components collected by the collection member is disposed on the upstream side, and the regeneration gas supply device includes an electric heating element and the electric heating element. It is equipped with a heat storage material that stores thermal energy and heats the regeneration gas by heat radiation. (Thus, when the collection member is regenerated, the thermal energy from the electric heating element stored in the heat storage material is released from the heat storage material to heat and raise the temperature of the regeneration gas, and the exhausted regeneration gas is used.) The collection member is regenerated by heating.

(Effects of the Invention) Therefore, according to the present invention, the thermal energy generated by the electric heating element is stored in the heat storage material in advance, and when the catalyst-equipped collection member is regenerated, the regenerated gas is heated by the stored thermal energy. Since the collection member is regenerated by heating, the capacity of the electric heating element and battery can be set smaller than conventional ones while effectively regenerating the collection member with catalyst.
As a result, the exhaust purification device for a diesel engine can be made more compact.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows the overall configuration of a diesel engine exhaust purification device according to a first embodiment of the present invention, in which 1 is a diesel engine, 2 is an intake passage for supplying intake air to the engine 1, and 3 is from the engine 1. This is an exhaust passage for discharging exhaust gas to the outside, and a catalyst-equipped collection member 4 is disposed in the middle of the exhaust passage 3 to collect particulate components such as carbon particles in the exhaust gas. . The catalyst-equipped collection member 4 is formed in a honeycomb shape from a porous material such as ceramic,
The open ends of the honeycomb holes are alternately closed at both ends of the honeycomb body, and the surface that comes into contact with the exhaust gas is coated with an oxidation catalyst made of noble metal or base metal.
Exhaust gas flows in through the honeycomb hole opening at one end, passes through a porous partition wall with air permeability, and flows out from the honeycomb hole opening at the other end, and the porous partition wall collects particulate components in the exhaust gas. At the same time, it acts as an oxidation catalyst and causes unburned gas in the exhaust gas to undergo an oxidation reaction.

A downstream end of a regeneration gas supply passage 5 is opened in the exhaust passage 3 on the T1 side of the catalyst collecting member 4, and an upstream end of the regeneration gas supply passage 5 is communicated with an air pump 6. A midway portion of the exhaust passage 3 is communicated with the downstream end of the regeneration gas supply passage 5 through a communication passage 7 on the upstream side of the connection portion of the exhaust passage 3 with the downstream end of the regeneration gas supply passage 5 . Further, an upstream end of an exhaust bypass passage 8 is opened between the connection part of the exhaust passage 3 with the downstream end of the regeneration gas supply passage 5 and the connection part with the communication passage 7, and the downstream end of the exhaust bypass passage 8 is the exhaust passage 3 on the downstream side of the collection member 4
It is opened to

Further, the connection portion of the exhaust passage 3δ with the communication passage 7 is filled with Nr!
A normally closed electromagnetic first on-off valve 9 that can be adjusted by X is provided, and when the first on-off valve 9 is closed, it cuts off communication between the communication passage 7 and the exhaust passage 3, and also closes the first on-off valve 9. The exhaust passages 3 and 3 on the upstream and downstream sides of the first on-off valve 9 communicate with each other, and when opened as shown by the imaginary line in the figure, the communication passage 7 is communicated with the exhaust passage 3 on the upstream side of the first on-off valve 9, and the first on-off valve 9 Open and close the upstream and downstream exhaust passages 3.3 to cut off communication between them. Further, at the connection portion of the exhaust passage 3 with the upstream end of the exhaust bypass passage 8, a normally closed electromagnetic second on-off valve 10 whose opening degree can be adjusted is provided.
is disposed, and the second on-off valve 10, in the closed state, cuts off communication between the exhaust bypass passage 8 and the exhaust passage 3, and allows the exhaust passages 3.3 on the upstream and downstream sides of the second on-off valve 10 to communicate with each other. , when opened as shown by the imaginary line in the figure, the exhaust bypass passage 8 is communicated with the exhaust passage 3 on the upstream side of the second on-off valve 10, and the exhaust passages 3 on the upstream and downstream sides of the second on-off valve 10 are communicated with each other. Open and close to shut off. Further, on the downstream side of the connecting portion of the regeneration gas supply passage 5 with the communication passage 7, there is a normally closed electromagnetic third valve that opens and closes the regeneration gas supply passage 5.
An on-off valve 11 is provided, and by operating the air pump 6 with the first on-off valve 9 closed and the second and third on-off valves 10.11 open, the air discharged from the air pump 6 is removed. , the collection member 4 is passed through a part of the regeneration gas supply passage 5 and the exhaust passage 3 as a regeneration gas for burning and removing particulate components collected by the collection member 4 with catalyst.
A regeneration gas supply device 12 is configured to supply the gas to the gas.

Further, an electric heating element 13 (heater) that generates heat when energized is embedded between the connection part of the regeneration gas supply passage 5 with the communication passage 7 and the third on-off valve 11, and the electric heating element 13 is embedded and sealed. A formed heat storage material 14 is disposed. The heat storage material 14 is made of, for example, a molten salt such as a phosphate having a melting point of 200 to 300"C or a mixed salt of potassium nitrate and sodium nitrite, a Teflon plastic with a melting point of 200°01 MII, or a wood metal. The regeneration gas i (discharged air from the air pump 6) is provided to store the thermal energy generated by the electric heating element 13 and to heat the regeneration gas i (air discharged from the air pump 6) by heat radiation.

On the other hand, 15 is the air pump 6, the first to third #ll
A battery 16 supplies power to the actuators of the valve closing valves 9 to 11 and the electric heating element 13;
The air pump electromagnetic switch 17 for OFF control is also a voltage transformer that changes the voltage applied to the air pump 6 to increase or decrease the rotational speed of the air pump 6, that is, the amount of air discharged. Further, 18 is a first on-off valve electromagnetic switch that controls opening and closing of the first on-off valve 9, and 19 is a second on-off valve 1o.
111] An electromagnetic switch for the second on-off valve to control, 2o an electromagnetic switch for the third on-off valve that controls the opening and closing of the third on-off valve 11, and 21 an electromagnetic switch for the heating element that controls the operation of the electric heating element 13. Therefore, each of the above electromagnetic switches 18 to 2
1 is normally in the OFF state.

Further, 22 was installed in the exhaust passage 3 immediately upstream of the catalyst-equipped collection member 4. An exhaust gas temperature detector 23 for detecting the exhaust gas temperature Tε was embedded in the heat storage material 14. A heat storage material temperature detector 24 detects the heat storage material temperature TR, and 24 is a clogging detector that detects that the collection member 4 has become clogged due to the accumulation of collected particulate components. The clogging detector 24 measures the electrical resistance value between two electrodes 25 and 25 embedded in the collection member 4 at a predetermined interval in the axial direction, and determines whether the electrical resistance value is a particulate component. The clogging state is detected by determining that the electrical conductivity of the carbon particles, which are the main component, has decreased to a predetermined value or less due to the increase in the electrical conductivity of the carbon particles, which are the main component thereof, as they are deposited on the collection member 4.

Further, 26 receives the outputs from the exhaust temperature detector 22, heat storage material m degree detector 23, and clogging detector 24, and receives the outputs from the h la transformer 117 and each electromagnetic switch 18.
~21, the control circuit 26 has a built-in microcomputer, and controls each detector 22~21.
The output signal from 24 is processed by a microcomputer and applied to the transformer 17 and the electromagnetic switches 18 to 21 at a predetermined value.
It outputs an IilJIII command signal.

Next, the operation of the above embodiment will be explained with reference to the control flowchart shown in FIG.

After the control flow starts, first, in step S+, it is determined whether the exhaust gas temperature Tε detected by the exhaust gas detector 22 is higher than the heat storage material temperature TR detected by the heat storage material temperature detector 23. When this determination is No that TE≦TR, the process moves to step S2, and the first to third on-off valves 9
- 11 are all kept closed to allow exhaust gas from the engine 1 to flow through only the exhaust passage 3 to the catalyst-equipped collection member 4. On the other hand, the determination in step S+ above is TE>
When the TR is YES, the process moves to step S3, and the first
and opens the third on-off valve 9, 11 and the second on-off valve 1
By closing 0, the exhaust gas is allowed to flow through the communication path 7 and the regeneration gas supply path 5 to the collection member 4. In the above state, particulate components such as carbon in the exhaust gas are collected by the collection member 4, and unburned gas is oxidized by the catalyst of the collection member 4, thereby purifying the exhaust residue.

In addition, the exhaust 'IA a T r, is a heat storage material @i[T
Since the exhaust gas flows to the heat storage material 14 side only when the temperature is higher than R, the heat energy of the exhaust gas causes the heat storage material 14 to
can be heated to raise the temperature.

After that, in step S4, it is determined whether the regeneration interval of the collection member 4 has reached the set interval or not.
It is determined whether or not the electrical resistance value between the collecting members 4 and 4 has decreased to a predetermined value or less, and the clogging detector 24 is outputting a clogging signal indicating that the collecting member 4 is clogged. When this determination is No, the process returns to step S1 to repeat the control flow, and when the determination is YES, a regeneration preparation process is entered.

In the regeneration preparation step, first, in step S5, the electric heating element 13 is energized to generate heat to heat the heat storage material 14, and the thermal energy generated by the heating element 13 is stored in the heat storage material 14. After that, in step S6, it is determined whether the exhaust gas temperature TE is higher than the wet surface TR of the heat storage material, and if this determination is T
When E≦TR (No), the process moves to step S7, and the exhaust gas is caused to flow through the exhaust passage 3 to the collection member 4 by keeping all the first to third on-off valves 9 to 11 closed. When the determination is YES (TE > TR), the process moves to step S8, and the first and third on-off valves 9.11 are opened and the second on-off valve 10 is closed, thereby allowing the exhaust gas to pass through the communication path 7 and the regeneration gas supply path 5. Collection member 4
to flow into. This prevents the heat storage material 14 from being cooled by the exhaust gas having a temperature lower than its temperature TR, thereby increasing the heat storage efficiency of the heat storage material 14.

Next, in step S9, it is determined whether the heat storage material temperature TR has reached a predetermined temperature or higher.

If this determination is No, the process returns to step S6 and the subsequent steps Sy and Ss are repeated. When the heat storage material temperature TR reaches a predetermined temperature or higher and the determination becomes YES, a regeneration process begins.

In this regeneration process, first in step Sho, the air pump 6 is operated, the first and second on-off valves 9 and 10 are closed, and only the third on-off valve 11 is opened. As a result, the air discharged from the air pump 6 flows into the catalyst-equipped collection member 4 through the regeneration gas supply passage 5, and the heat stored in the heat storage state during the passage through the -F distribution regeneration gas supply passage 5. Due to the heat exchange action with the material 14, it is heated to a high regeneration temperature To (To≧600'C) at which the collection member 4 can be regenerated, and becomes regeneration gas. This high humidity regeneration gas (air)
As the particles flow into the collection member 4, the particulate components collected on the collection member 4 are heated and combustion begins. In addition, in this question, the exhaust gas from the engine 1 is passed through the exhaust bypass passage 8.
is discharged to the outside through the

Next, the process moves to step Sn, and the pressure transformer 17 is controlled to reduce the air discharge rate of the air pump 6 over time. As a result, even if the particulate component decreases due to the progress of combustion, the regeneration gas will not be supplied in excess, and the air pump 6 will be compensated accordingly.
can reduce energy consumption.

Then, after a certain period of time has elapsed, when the clogging state of the collection member 4 is resolved and the electric resistance between the electrodes 25 and 25 returns to the original value, in the final step 812, the electric heating element 1
3 and the air pump 6 are stopped. With the above, one cycle of the control flow is completed, and the same control flow as described above is repeated thereafter.

Therefore, in this case, the thermal energy from the electric heating element 13 is gradually stored in the heat storage material 14 during the regeneration preparation process for the catalyst-equipped collection member 4, and during regeneration, the heat storage material 14
Because the discharge air (regeneration gas) from the air pump 6 is heated to the regeneration temperature To by the thermal energy stored in Therefore, the heat generation capacity of the electric heating element 13 and the electric capacity of the battery 15 can be set small.

3 and 4 show the second embodiment, and the same parts as in FIGS. 1 and 2 are given the same reference numerals and detailed explanation thereof is omitted), and the collection member 4 is recycled. Exhaust gas is used as regeneration gas for this purpose.

That is, in this embodiment, as shown in FIG. 3, an oxygen 81m detector 27 for detecting the oxygen concentration in the exhaust gas is installed in the exhaust passage 3 immediately downstream of the catalyst-equipped collection member 4. There is. Further, the control circuit 26' is provided so as to add an output signal from the oxygen concentration detector 27 to one of its input signals to control the transformer 17 and each electromagnetic switch 18 to 21. The configuration is similar to that of the first embodiment described above.

The operation of this second embodiment will be explained along the control flowchart shown in FIG. 4. The normal process and regeneration preparation process from step S1 to step Ss are performed in the same manner as in the first embodiment. And step S
When the determination in step 9, that is, the determination as to whether or not the heat storage material temperature TR has reached a predetermined temperature or higher, is YES and the regeneration process begins, first, in step am, the exhaust air filter TE of the engine 1 is
is higher than the regeneration temperature ITo for the collection member 4, and if this determination is No (Tε≦To), the exhaust temperature T is further increased in step Sn.
It is determined whether ε is at a predetermined temperature of 81 degrees or higher, which is lower than the regeneration concentration To, and if this determination is No, the process returns to step S and the exhaust gas 1 degree TE is kept at a predetermined temperature or higher. .

If the determination in step Su above becomes YES, the second rl
By closing the closing valve 10, opening the third opening/closing valve 11, and adjusting the opening degree of the first opening/closing valve 9, a part of the exhaust gas is caused to flow into the regeneration gas supply passage 5. !
15 heat storage@14 until the temperature rises to regeneration Ii degree To, the exhaust gas is returned to the exhaust passage 3 again, and the entire exhaust gas is heated to regeneration maT0*m. The exhaust gas heated by the heating valve 81 to this regeneration concentration To becomes a regeneration gas (-1), which flows into the member 4 and the particulate components collected by the collection member 4 are heated and burned.

On the other hand, the determination in the above step 9 trout is Tε>T.

When YES, all the first to 311ffl valves 9 to 11 are closed in step So, and the high-temperature exhaust gas is directly made to flow into the collection member 4 through the exhaust passage 3 as regeneration gas.

As a result, the particulate components collected by the collection member 4 are heated and burned and removed in the same manner as described above.

Then, in step SN of step 812 or step S+s, it is determined whether the oxygen concentration in the exhaust gas detected by the oxygen concentration detector 27 is below a set value. When this determination is No, that is, when more oxygen in the exhaust gas remains than the set m degrees even after the oxygen in the exhaust gas is consumed in the combustion of particulate components in the regenerated state of the collection member 4, the exhaust gas is discharged from the engine 1. Assuming that the exhaust gas thus produced is sufficient with oxygen for combustion of the fractional components, the system returns to the Makoto step S trout and repeats the subsequent control flow. On the other hand, when the judgment in ST and knob SH is YES, that is, the oxygen 11 in the exhaust gas of the collecting member 4 is
When the temperature is below the set concentration, it is assumed that there is not enough oxygen in the exhaust gas from the engine 1 to burn the particulate components sufficiently, and the oxygen deficiency in the exhaust gas is replenished in the next step S+s. In order to keep the concentration within the set value, the first on-off valve 9 is closed and the third on-off valve 11 is opened, and the air pump 6 is operated to adjust the air discharge amount and the opening degree of the second on-off valve 1O. . Thereby, the particulate components collected by the collection member 4 can be reliably burned and removed under a sufficient amount of oxygen (air).

Thereafter, when the regeneration of the collection member 4 is completed, the electric heating element 13 and the air pump 6 are stopped in the final step S+s, and one cycle of the control flow is completed.

Therefore, in addition to being able to achieve the same effects as in the first embodiment, this embodiment also utilizes high-temperature exhaust gas as the regeneration gas.
There is an advantage that the temperature can be easily raised to a temperature of T o, the collection member 4 can be regenerated efficiently, and the energy consumption by the air pump 6 can be further reduced.

In addition, FIGS. 5 and 6 show the third embodiment, and the same parts as in FIGS. 1 to 4 are given the same reference numerals and detailed explanations are omitted), a diesel engine with a supercharger. It was applied to

That is, in this embodiment, the turbine 28 is disposed in the exhaust passage 3 between the connection part with the communication passage 7 and the second on-off valve 10, and the turbine 28 and the rotating shaft are disposed in the middle of the intake passage 2. A blower 3O is disposed, which is drive-connected via a blower 29, and the exhaust gas flow rotates the turbine 28, which rotates the blower 3O and supercharges the intake air to the engine 1 by the blower 3O. Supercharger 31
is configured. Further, in the middle of the communication passage 7, when the exhaust pressure applied to the turbine 28 of the supercharger 31 rises above a predetermined pressure, a waste gate pulp 33 opens against the urging force of a spring 32 to open the communication passage 7. The exhaust temperature detector 22, the first on-off valve 9, and the first on-off valve electromagnetic switch 18 in the above embodiment are omitted. The rest of the structure is the same as that of the second embodiment.

The operation in this embodiment is performed according to the flowchart shown in FIG. That is, in a state in which the waste gate pulp 33 is opened at the time of starting, that is, in a state in which the engine 1 is in a high rotation and high load region and the exhaust gas trace Tε and pressure from the engine 1 are increasing, step S1 is performed. In this step, it is determined whether the regeneration interval of the collection member 4 has reached the set interval, and if this determination is NO, the same step 1 is repeated. If the determination in step S1 is YES, the heat storage material 14 is heated by energizing the electric heating element 13 in step S2, and the thermal energy of the heating element 13 is stored in the heat storage material 14. After that, in step S3, it is determined whether the temperature TR of the heat storage material 14 has risen to a predetermined humidity or higher; the determination is -N.
o, the same step S3 is repeated. When the temperature of the heat storage material temperature TR rises to a predetermined humidity or higher and the determination in step S3 becomes YES%l:, the oxygen concentration in the exhaust gas is set to the set value in step S4 while regenerating the collection member 4. Determine whether it is less than or equal to or not, and the determination is N.

If so, the same step S4 is repeated. On the other hand, if the determination in step S4 is YES, in the next step S5, the third on-off valve 11 is opened in order to keep the oxygen in the exhaust gas at 11 degrees Celsius within the set value, and the air pump 6 is operated to of the discharge amount and the second on-off valve 10. Regeneration of the collection member 4 is continued while adjusting the opening degree. When the regeneration of the collection member 4 is completed, the electric heating element 13 and the air pump 6 are stopped in the next step S6, and one cycle of the control flow is completed.

Therefore, in addition to being able to achieve the same effects as in the above embodiments, this embodiment also takes advantage of the features of a supercharged diesel engine to raise the temperature TE of the exhaust gas, thereby reducing the wastegate pulp. Since the high-temperature exhaust gas flows to the heat storage material 1-4 side only when 33 is opened, the exhaust temperature detector 22, the first on-off valve 9, etc. are not required, and the device configuration and control system can be simplified. be.

It should be noted that the present invention is not limited to the above embodiments,
It also includes various modifications; for example, in the above embodiment, the amount of heat generated by the electric heating element 13 remains unchanged; however, during regeneration, it is controlled to increase more than during heat storage (when preparing for regeneration). You may do so. This can be done, for example, by arranging one heating element 13 and increasing the number of heating elements 13 activated during regeneration than during heat storage, by increasing and changing the voltage applied to the heating element 13 during regeneration, or by increasing the number of heating elements 13 activated during regeneration, or by increasing the voltage applied to the heating element 13 during regeneration, or by increasing the number of heating elements 13 activated during regeneration. This is achieved by, for example, heating the outer surface of the material 14 with the heating element 13. By variably controlling the calorific value of the heating element 13 in this way, the regeneration gas is strongly heated not only by the heat storage material 14 but also by the heating element 13, so that the collection member 4 can be regenerated even more efficiently. It can be carried out.

In addition, by supplying appropriate fuel or oil to the heat storage material 14 during regeneration, the above effects can be achieved with the aim of increasing the exhaust gas temperature Tε and promoting the oxidation reaction in the catalyst-equipped collection member 4 by increasing the amount of unburned gas. You may also obtain

Furthermore, the heat storage material 14 may be heated by circulating high-temperature exhaust gas (gas generated by combustion of particulate components) after passing through the collection member 4 during regeneration to the heat storage material 14 side.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is an overall configuration diagram showing the first embodiment, FIG. 2 is a flowchart of the control system, and FIG. 3 is an overall configuration diagram showing the second embodiment. , FIG. 4 is a flowchart of the same control system, FIG. 5 is an overall configuration diagram showing a third embodiment, and FIG. 6 is a flowchart of the same control system. DESCRIPTION OF SYMBOLS 1... Engine, 3... Exhaust passage, 4... Catalyst-equipped collection member, 6... Air pump, 9... First on-off valve,
10... 2nd R leap valve, 11... 3rd on-off valve, 12.
12'12''... Regeneration gas supply device, 13... Electric heating element, 14... Heat storage material, 22... Exhaust temperature detector, 23... Heat storage material concentration detector, 24... Clogging detector, 26.26'26"...Control circuit, 27...
・Oxygen 11 degree detector, 31...supercharger, 33...waste gate valve. Figure 5 Figure 6

Claims (1)

[Claims] (1) In an exhaust purification device for a diesel engine that is provided with a catalyst-equipped collection member that collects particulate components such as carbon particles in the exhaust passage, the catalyst-equipped collection member collects particulate components such as carbon particles on the upstream side of the catalyst-equipped collection member. A regeneration gas supply device is installed to supply regeneration gas for burning and removing the single particle component, and the regeneration gas supply device is equipped with an electric heating element and an electric heating element that stores the thermal energy of the electric heating element and radiates the heat. An exhaust gas purification device for a diesel engine, comprising: a heat storage material that heats the regenerated gas.